Quiz 11: Oxygen therapy

Please choose the one, most correct answer to each question or statement.

1. Metabolism requiring oxygen is called:
   • Oxidation
   • Anaerobic metabolism
   • Anabolic metabolism
   • Aerobic metabolism
2. Most oxygen is carried in the blood by:
   • The red blood cells
   • The white blood cells
   • The platelets
   • The serum
3. What is the normal concentration of oxygen in room air?
   • 20%
   • 21%
   • 22%
   • 30%
4. The amount of oxygen carried in the blood can be accurately determined by:
   • Deciding whether the tongue is pink or cyanosed
   • Measuring the flow of oxygen into the head box
   • Using a pulse oximeter
   • Using an oxygen monitor
5. What is the abbreviation for the partial pressure of oxygen in arterial blood?
   • PaO₂
   • SaO₂
   • FiO₂
   • O₂
6. What is the normal partial pressure of oxygen in the arterial blood of a healthy newborn infant?
   • 6–8 kPa
   • 8–10 kPa
   • 10–12 kPa
   • 12–20 kPa
7. What is the normal oxygen saturation in the arterial blood of a newborn infant?
   • 80–86%
   • 86–92%
   • 92–95%
   • 95–100%
8. When oxygen is given to infants it is usually blended with:
   • Nitrogen
   • Air
   • Carbon dioxide
   • Hydrogen
9. Lack of enough oxygen in inspired air may:
   • Damage the airways.
   • Damage the red cells.
   • Damage the brain.
   • None of the above.
10. Extra oxygen should be given to:
    • All infants at birth
    • All infants under 1500 g
    • All infants with peripheral cyanosis
    • All infants with central cyanosis
11. What is a safe concentration of inspired oxygen?
    • 0.40 (i.e. 40%)
    • 0.25 (i.e. 25%)
    • 0.10 (i.e. 10%)
    • Any FiO₂ that gives a normal partial pressure or normal saturation of oxygen in the blood
12. Excess oxygen in the inspired air may cause:
    • Deafness
    • Blindness
    • Paralysis
    • Mental retardation
13. Retinopathy of prematurity is usually seen:
    • In underweight for gestational age infants
    • In preterm infants
    • In infants who have been removed from oxygen too soon
    • In infants who have not been given extra oxygen
14. Retinopathy of prematurity can be largely prevented by:
    • Carefully controlling the PaO₂ or SaO₂
    • Never giving extra oxygen
    • Never giving 100% oxygen
    • Humidifying the oxygen
15. 100% oxygen may damage the infant and therefore:
    • Should never be given to any infant
    • Should not be given for more than 24 hours
    • Should only be given if a lower concentration of oxygen fails to correct central cyanosis
    • Should never be given to a preterm infant
16. Oxygen given via an endotracheal tube should be:
    • Cooled and humidified
    • Warmed and humidified
    • Sterilised
    • Warmed only
17. Extra oxygen is best given into:
    • A head box
    • An incubator
    • A face mask
    • A nasogastric tube
18. The concentration of oxygen given to an infant is best controlled by:
    • Using a venturi or blender
    • Altering the flow rate
    • Altering the size of the head box
    • Increasing or decreasing the amount of water in the humidifier
19. To increase the concentration of oxygen that an infant is receiving:
    • Decrease the alarm limit on the oxygen monitor.
    • Increase the alarm limit on the oxygen monitor.
    • Decrease the fraction of oxygen given.
    • Increase the fraction of oxygen given.
20. The amount of extra oxygen given into a headbox should be measured:
    • As a flow rate (e.g. 5 litres per minute)
    • As a partial pressure (e.g. 5 kPa)
    • As a fraction (e.g. FiO₂ 0.5)
    • As a weight (e.g. 500 g)